What is the Song Poetry Movement? What are its representative figures and theoretical propositions?

"Song Poetry Movement", also known as "Song Poetry School", is a representative school of poetry before and after the Opium War, which advocates learning as poetry to expand the influence of Song poetry. During the Daoxian period, it was advocated by Cheng Enze, a scholar, who represented the poet He, He, He and He. They flaunted the Song Dynasty, took Su Shi and Huang Tingjian as their ancestors, and opposed living only in the prosperous Tang Dynasty. They summed up the experience and lessons of the rise and fall of various poetic schools since the early Qing Dynasty, and put forward the theory and requirements for changing the poetic style. Emphasize that "poetry is the voice of the heart", express your feelings sincerely and credibly; On the basis of Weng Fanggang's learning theory in Qing Dynasty, he put forward the theory of "learning while learning", put forward the idea of combining poetry creation with dealing with people, and emphasized learning from the past and innovating. Their poetics is still based on the gentle and honest poetry teaching of Confucianism, emphasizing honesty, truth and vulgarity, and must abide by the laws and regulations of politics and religion. They advocated writing exegesis as poetry, emphasizing erudition and reading, and opposed imitating the vulgar style of the prosperous Tang Dynasty. It is important to learn from Huang Tingjian, a Jiangxi school of poetry, and then learn from famous poets in Tang and Song Dynasties such as Du Fu and Han Yu, and put forward that poetry should have "temperament" and "learning", which is of certain significance to expanding the influence of Song poetry. However, they embarked on a formalistic tendency of taking textual research as poetry, and most of their works were divorced from life and reality. The theory of Song poetry movement was inherited by later "Tongguang".